TWI805043B - Method of evaluation for surface protective film - Google Patents

Method of evaluation for surface protective film Download PDF

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TWI805043B
TWI805043B TW110139623A TW110139623A TWI805043B TW I805043 B TWI805043 B TW I805043B TW 110139623 A TW110139623 A TW 110139623A TW 110139623 A TW110139623 A TW 110139623A TW I805043 B TWI805043 B TW I805043B
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surface protection
protection film
stiffness
film
moiré
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TW110139623A
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TW202229833A (en
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徐維廷
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住華科技股份有限公司
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Abstract

The present disclosure provides a method of evaluation for a surface protective film, including a step of measuring a rigidity decay rate, which includes rolling a surface protective film into a cylindrical sample, followed by fixing the surface protective film on a fixture, wherein the cylindrical sample has a first height; pressing the cylindrical sample to a second height, and measuring a rigidity variation of the surface protective film over time; and calculating the rigidity decay rate of the surface protective film from the rigidity variation of the surface protective film over time; and using the rigidity decay rate of the surface protective film as an index to evaluate the anti-mura property of the surface protective film.

Description

表面保護膜的評估方法Evaluation method of surface protective film

本揭露是有關於一種表面保護膜的評估方法，特別是有關於一種表面保護膜的抗雲紋（anti-mura）評估方法。The present disclosure relates to an evaluation method of a surface protection film, in particular to an evaluation method of anti-mura of a surface protection film.

偏光膜為廣泛應用於顯示器之光學元件，隨著顯示器的應用越來越廣，例如，手機、穿戴式裝置等，對偏光膜品質的要求也越來越高。偏光膜在製成後通常會搭配表面保護膜貼合至各種尺寸的顯示器後再撕除表面保護膜，因此業界無不致力於改善表面保護膜的品質。Polarizing film is an optical component widely used in displays. As displays become more and more widely used, such as mobile phones and wearable devices, the quality requirements for polarizing films are also getting higher and higher. After the polarizing film is made, it is usually attached to displays of various sizes with a surface protection film, and then the surface protection film is removed. Therefore, the industry is committed to improving the quality of the surface protection film.

為了解決上述問題，本揭露提供一種表面保護膜的評估方法，包括：硬挺度衰減率量測步驟，包括：將表面保護膜捲曲成筒狀樣品後，固定於夾具上，其中筒狀樣品具有第一高度；下壓筒狀樣品至第二高度後停止，並且量測表面保護膜隨時間的硬挺度變化；以及由表面保護膜隨時間的硬挺度變化計算表面保護膜的硬挺度衰減率；以及以表面保護膜的硬挺度衰減率作為指標，評估表面保護膜的抗雲紋特性。In order to solve the above problems, the present disclosure provides an evaluation method of a surface protection film, including: the step of measuring the stiffness decay rate, including: after the surface protection film is curled into a cylindrical sample, it is fixed on a fixture, wherein the cylindrical sample has the first a height; stop after pressing down the cylindrical sample to a second height, and measure the stiffness change of the surface protection film over time; and calculate the stiffness decay rate of the surface protection film from the stiffness change of the surface protection film over time; and The stiffness attenuation rate of the surface protection film is used as an index to evaluate the anti-moiré characteristics of the surface protection film.

以下的揭示內容提供許多不同的實施例或範例，以展示本發明實施例的不同部件。以下將揭示本說明書各部件及其排列方式之特定範例，用以簡化本揭露敘述。當然，這些特定範例並非用於限定本揭露。例如，若是本說明書以下的發明內容敘述了將形成第一部件於第二部件之上或上方，即表示其包括了所形成之第一及第二部件是直接接觸的實施例，亦包括了尚可將附加的部件形成於上述第一及第二部件之間，則第一及第二部件為未直接接觸的實施例。此外，本揭露說明中的各式範例可能使用重複的參照符號及/或用字。這些重複符號或用字的目的在於簡化與清晰，並非用以限定各式實施例及/或所述配置之間的關係。The following disclosure provides many different embodiments, or examples, to demonstrate various components of embodiments of the invention. Specific examples of each component and its arrangement in the present specification will be disclosed below to simplify the description of the present disclosure. Of course, these specific examples are not intended to limit the present disclosure. For example, if the content of the invention described below in this specification describes that the first component is formed on or above the second component, it means that it includes the embodiment in which the formed first and second components are in direct contact, and also includes still Additional features may be formed between the first and second features described above, the first and second features being an embodiment where the first and second features are not in direct contact. In addition, various examples in this disclosure may use repeated reference symbols and/or words. These repeated symbols or words are used for the purpose of simplification and clarity, and are not used to limit the relationship between various embodiments and/or the described configurations.

再者，為了方便描述圖式中一元件或部件與另一（些）元件或部件的關係，可使用空間相對用語，例如「在…之下」、「下方」、「下部」、「上方」、「上部」及諸如此類用語。除了圖式所繪示之方位外，空間相對用語亦涵蓋使用或操作中之裝置的不同方位。當裝置被轉向不同方位時（例如，旋轉90度或者其他方位），則其中所使用的空間相對形容詞亦將依轉向後的方位來解釋。Furthermore, in order to facilitate the description of the relationship between one element or component and another (several) elements or components in the drawings, spatially relative terms may be used, such as "under", "below", "lower", "above" , "upper" and similar terms. Spatially relative terms encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. When the device is turned to a different orientation (for example, rotated 90 degrees or otherwise), the spatially relative adjectives used therein shall also be interpreted in accordance with the turned orientation.

在此，「約」、「大約」、「大抵」之用語通常表示在一給定值或範圍的20%之內，較佳是10%之內，且更佳是5%之內，或3%之內，或2%之內，或1%之內，或0.5%之內。應注意的是，說明書中所提供的數量為大約的數量，亦即在沒有特定說明「約」、「大約」、「大抵」的情況下，仍可隱含「約」、「大約」、「大抵」之含義。Here, the terms "about", "approximately" and "approximately" usually mean within 20%, preferably within 10%, and more preferably within 5%, or within 3% of a given value or range. Within %, or within 2%, or within 1%, or within 0.5%. It should be noted that the quantities provided in the instructions are approximate quantities, that is, in the absence of specific descriptions of "about", "approximately" and "approximately", "about", "approximately" and "approximately" can still be implied "probably" meaning.

基於偏光板（貼合表面保護膜後）的產品生產效率，相當重視翹曲程度，若產品發生負翹曲（即偏光板往遠離表面保護膜的那一側翹曲）問題，容易造成使用者無法順利將偏光板貼合至玻璃基板。為了避免偏光板產品的負翹曲問題，可在製造偏光板時將翹曲調整成正翹曲（即偏光板往表面保護膜的那一側翹曲），而翹曲調整通常是藉由對表面保護膜加大張力來達成。Based on the production efficiency of the polarizer (after the surface protection film is attached), the degree of warpage is very important. If the product has negative warpage (that is, the polarizer is warped to the side away from the surface protection film), it is easy to cause users Unable to bond the polarizer to the glass substrate smoothly. In order to avoid the problem of negative warpage of polarizer products, the warpage can be adjusted to positive warpage during the manufacture of polarizers (that is, the polarizer is warped toward the side of the surface protective film), and warpage adjustment is usually done by adjusting the surface The protective film increases tension to achieve.

然而，張力加大會讓表面保護膜受到延伸而產生形變，經時後會發生形變恢復而產生表面保護膜硬挺度衰減的現象，使得所製造的面板會容易產生雲紋（mura），其中雲紋是指面板的亮度、色度不均勻，會妨礙顯示器的性能。此外，形變恢復的過程中也會造成表面保護膜滑動，且表面保護膜張力加大可能會造成表面保護膜變形且厚度不均，這些原因也會容易造成面板雲紋。However, the increase in tension will cause the surface protective film to be stretched and deformed, and the deformation will recover after time, resulting in the attenuation of the stiffness of the surface protective film, making the manufactured panel prone to moiré (mura). It refers to the uneven brightness and chromaticity of the panel, which will hinder the performance of the display. In addition, the process of deformation recovery will also cause the surface protection film to slide, and the increased tension of the surface protection film may cause deformation and uneven thickness of the surface protection film. These reasons will also easily cause panel moiré.

本發明實施例提供一種用於偏光板之表面保護膜的評估方法，其中包括硬挺度衰減率量測步驟，並且利用表面保護膜的硬挺度衰減率作為指標以評估表面保護膜的抗雲紋特性，以下將進一步詳細說明硬挺度衰減率的量測方式的實施例。應當理解的是，本發明所揭露的硬挺度衰減率的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整硬挺度衰減率量測步驟中所使用的參數。An embodiment of the present invention provides an evaluation method for a surface protection film of a polarizing plate, which includes a step of measuring the stiffness decay rate, and uses the stiffness decay rate of the surface protection film as an index to evaluate the anti-moiré characteristic of the surface protection film , the embodiment of the measurement method of the stiffness attenuation rate will be further described in detail below. It should be understood that the method for measuring the stiffness decay rate disclosed in the present invention is not limited to the following parameters, and those skilled in the art can freely adjust the parameters used in the stiffness decay rate measurement step.

在本揭露的表面保護膜之硬挺度衰減率量測步驟之前可進行樣品前處理。在一些實施例的樣品前處理中，首先可將裁切後的表面保護膜（例如長度30cm，寬度20cm）藉由使用適當重量（例如2kg）的滾輪，貼合在同樣尺寸的軟性材料上，以形成貼合後的表面保護膜樣品。貼合完畢後，可將樣品放置於溫度25℃且濕度55%的環境下1天，使表面保護膜和軟性材料的貼合更加牢固，並且在表面保護膜的硬挺度衰減率量測步驟前，將貼合後的表面保護膜和軟性材料裁切成適當尺寸，例如長度170mm且寬度15mm的尺寸，成為硬挺度衰減率量測的樣品。應當理解的是，在上述樣品前處理中，也可以使用其他尺寸的表面保護膜和軟性材料。Sample pretreatment may be performed before the step of measuring the stiffness decay rate of the surface protection film of the present disclosure. In the sample pretreatment in some embodiments, firstly, the cut surface protection film (for example, length 30cm, width 20cm) can be pasted on the soft material of the same size by using a roller with an appropriate weight (for example, 2kg). To form a laminated surface protection film sample. After lamination, the sample can be placed in an environment with a temperature of 25°C and a humidity of 55% for 1 day to make the bonding between the surface protective film and the soft material more firm, and before the measurement of the stiffness decay rate of the surface protective film , cut the laminated surface protection film and soft material into appropriate size, for example, a size with a length of 170mm and a width of 15mm, which becomes a sample for the measurement of the stiffness attenuation rate. It should be understood that other sizes of surface protection films and soft materials can also be used in the sample pretreatment described above.

上述表面保護膜的材料並未特別限定，表面保護膜的材料可為透明性、機械強度、熱穩定性、水分阻隔性等優良之熱可塑性樹脂，例如可包括纖維素系樹脂、丙烯酸系樹脂、非結晶性聚烯烴系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、或上述之任意組合。纖維素系樹脂是指纖維素中部分的羥基被乙酸酯化之樹脂，或是一部分被乙酸酯化、一部分被其他酸酯化之混合酯。纖維素系樹脂較佳為纖維素酯系樹脂，更佳為乙醯基纖維素系樹脂，例如三乙醯基纖維素、二乙醯基纖維素、纖維素乙酸酯丙酸酯、纖維素乙酸酯丁酸酯等。被充分酯化的纖維素稱三醋酸纖維素（triacetate cellulose，TAC）、丙烯酸樹脂膜、聚芳香羥樹脂膜、聚醚樹脂膜、環聚烯烴樹脂膜（例如聚冰片烯樹脂膜）。聚碳酸酯系樹脂為例如由碳酸與二醇或雙酚所形成的聚酯，例如聚對苯二甲酸乙二醇酯（polyethylene Terephthalate，PET）、聚丙稀（polypropylene，PP）、聚乙烯（polyethylene，PE）。非結晶性聚烯烴系樹脂為例如環狀烯烴單體（共）聚合物（cyclo olefin (co)polymers，COC/COP），由降冰片烯、環戊二烯、二環戊二烯、四環十二碳烯等開環聚合物，或與烯烴類之共聚合物所構成、聚碳酸酯（polycarbonate，PC）以及上述任意組合所組成的一族群。除此之外，保護層材料還可以是例如（甲基）丙烯酸系、胺基甲酸酯系、丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等熱硬化性樹脂或紫外線硬化型樹脂。此外，亦可進一步對上述表面保護膜的材料實行表面處理，例如，抗眩光處理、抗反射處理、硬塗處理、帶電防止處理或抗污處理等。The material of the surface protection film is not particularly limited. The material of the surface protection film can be a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc., for example, it can include cellulose-based resin, acrylic resin, Amorphous polyolefin resin, polyester resin, polycarbonate resin, or any combination of the above. Cellulose-based resins refer to resins in which part of the hydroxyl groups in cellulose are esterified with acetate, or mixed esters in which part is esterified with acetate and part is esterified with other esters. The cellulose resin is preferably a cellulose ester resin, more preferably an acetyl cellulose resin, such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate etc. Fully esterified cellulose is called triacetate cellulose (TAC), acrylic resin film, polyaryl hydroxy resin film, polyether resin film, cyclopolyolefin resin film (such as polybornene resin film). Polycarbonate resins are, for example, polyesters formed from carbonic acid and diols or bisphenols, such as polyethylene terephthalate (polyethylene Terephthalate, PET), polypropylene (polypropylene, PP), polyethylene (polyethylene , PE). Amorphous polyolefin-based resins are, for example, cyclo olefin (co)polymers (COC/COP), composed of norbornene, cyclopentadiene, dicyclopentadiene, tetracycline Ring-opening polymers such as dodecene, or copolymers with olefins, polycarbonate (polycarbonate, PC), and a group of any combination of the above. In addition, the protective layer material can also be thermosetting resins such as (meth)acrylic, urethane, acrylic urethane, epoxy, polysiloxane, etc., or ultraviolet curing resins. type resin. In addition, surface treatment may be further performed on the material of the above-mentioned surface protection film, for example, anti-glare treatment, anti-reflection treatment, hard-coat treatment, anti-static treatment, or anti-fouling treatment.

上述軟性材料可為一單層或多層光學膜。軟性材料的材料亦並未特別限定，軟性材料的材料可以包括三醋酸纖維素（TAC）、二醋酸纖維素（DAC）、聚甲基丙烯酸甲酯（PMMA）、聚對苯二甲酸乙二酯（PET）、聚萘二甲酸乙二酯、烯烴樹脂、聚碳酸酯樹脂（PC）、環烯烴樹脂、定向拉伸性聚丙烯（OPP）、聚乙烯（PE）、聚丙烯（PP）、環烯烴聚合物（COP）、環烯烴共聚合物（COC）、胺基甲酸酯（PU）、丙烯酸胺基甲酸酯、環氧樹脂、聚矽氧樹脂、或上述之任意組合。The flexible material mentioned above can be a single-layer or multi-layer optical film. The material of the soft material is not particularly limited, and the material of the soft material may include cellulose triacetate (TAC), cellulose diacetate (DAC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate, olefin resin, polycarbonate resin (PC), cycloolefin resin, oriented polypropylene (OPP), polyethylene (PE), polypropylene (PP), cyclo Olefin polymer (COP), cycloolefin copolymer (COC), urethane (PU), acrylic urethane, epoxy resin, silicone resin, or any combination of the above.

在一個特定的實施例中，表面保護膜的材料可包括聚甲基丙烯酸甲酯，而軟性材料的材料可包括三醋酸纖維素。In a specific embodiment, the material of the surface protection film may include polymethyl methacrylate, and the material of the soft material may include cellulose triacetate.

在一個特定的實施例中，表面保護膜的材料可包括聚甲基丙烯酸甲酯，而軟性材料可為一多層光學膜層，與表面保護膜貼合後成為一偏光板。在一些實施例中，偏光板的結構可以包括各種膜層，由上到下依序為例如：表面保護膜、黏著層、第一保護層（材料例如為三醋酸纖維素薄膜）、作為偏光材料的聚乙烯醇薄膜、第二保護層（材料例如為三醋酸纖維素薄膜）、黏著層、離型膜（release film）等，但在本揭露的結構並非限定於此，例如可省略第一及/或第二保護層，或使用其他常用材料。In a specific embodiment, the material of the surface protection film may include polymethyl methacrylate, and the soft material may be a multi-layer optical film layer, which becomes a polarizer after bonding with the surface protection film. In some embodiments, the structure of the polarizing plate can include various film layers, such as: surface protection film, adhesive layer, first protective layer (material such as triacetate cellulose film), as a polarizing material polyvinyl alcohol film, a second protective layer (such as a triacetate cellulose film), an adhesive layer, a release film (release film), etc., but the structure of this disclosure is not limited thereto, for example, the first and / or a second protective layer, or use other common materials.

在一些實施例中，黏著層包含壓敏性黏著劑（pressure sensitive adhesive, PSA）、熱敏性黏著劑、溶劑揮發性黏著劑、及UV可固化黏著劑。在一些實施例中，壓敏性黏著劑包含天然橡膠、合成橡膠、苯乙烯嵌段共聚物、（甲基）丙烯酸系嵌段共聚物、聚乙烯基醚、聚烯烴、及聚（甲基）丙烯酸酯。在一些實施例中，（甲基）丙烯酸（或丙烯酸酯）係指丙烯酸及甲基丙烯酸類二者。在另一些實施例中，壓敏性黏著劑包含（甲基）丙烯酸酯、橡膠、熱塑性彈性體、聚矽氧、胺基甲酸酯、及其組合。在一些實施例中，壓敏性黏著劑係基於（甲基）丙烯酸系壓敏性黏著劑或基於至少一種聚（甲基）丙烯酸酯。In some embodiments, the adhesive layer includes a pressure sensitive adhesive (PSA), a heat sensitive adhesive, a solvent volatile adhesive, and a UV curable adhesive. In some embodiments, the pressure sensitive adhesive comprises natural rubber, synthetic rubber, styrene block copolymer, (meth)acrylic block copolymer, polyvinyl ether, polyolefin, and poly(meth) Acrylate. In some embodiments, (meth)acrylic (or acrylate) refers to both acrylic and methacrylic. In other embodiments, the pressure sensitive adhesive comprises (meth)acrylate, rubber, thermoplastic elastomer, silicone, urethane, and combinations thereof. In some embodiments, the pressure sensitive adhesive is based on a (meth)acrylic pressure sensitive adhesive or based on at least one poly(meth)acrylate.

接著參照第1圖，第1圖是根據一些實施例，繪示了表面保護膜的硬挺度衰減率量測步驟的示意圖。首先在步驟S1中，將貼合有軟性材料的表面保護膜樣品102捲成橫截面是例如橢圓形的筒狀，並且將樣品102固定在拉力機的夾具104的下部104-1上，其中筒狀樣品102具有第一高度h1，第一高度h1的範圍為例如50~90mm。在一些實施例中，在樣品102長度為170mm的情況下，第一高度h1可以是例如80mm。接著在步驟S2中，將夾具的上部104-2往下移動以碰觸筒狀樣品102，並使筒狀樣品102維持第一高度h1。Referring next to FIG. 1 , FIG. 1 is a schematic diagram illustrating the steps of measuring the stiffness decay rate of a surface protection film according to some embodiments. First, in step S1, the surface protection film sample 102 bonded with a soft material is rolled into a cylindrical shape such as an ellipse in cross section, and the sample 102 is fixed on the lower part 104-1 of the clamp 104 of the tensile machine, wherein the cylindrical The shape sample 102 has a first height h1, and the range of the first height h1 is, for example, 50-90 mm. In some embodiments, where the length of the sample 102 is 170 mm, the first height h1 may be, for example, 80 mm. Then in step S2, the upper part 104-2 of the jig is moved down to touch the cylindrical sample 102, and the cylindrical sample 102 is maintained at the first height h1.

接著在步驟S3中，採用例如130mm/min的下壓速度開始對筒狀樣品102施壓，且下壓至筒狀樣品102具有第二高度h2後停止，並且量測表面保護膜隨時間的硬挺度變化，其中第二高度的範圍為例如5~60mm。關於第二高度h2的選擇，如果第二高度太大，則樣品的變形量會較小，雖然樣品仍會發生硬挺度衰減，但各樣品的性能差異將太小而難以辨認；反之，如果第二高度太小，則樣品的變形量會較大，但有時會造成樣品破裂而導致數據難以判讀。在一些實施例中，在樣品102長度為170mm的情況下，第二高度h2可以是例如15mm。接著在步驟S4（未顯示）中，當觀察到表面保護膜的硬挺度發生下降一段時間後停止量測，並且利用表面保護膜隨時間的硬挺度變化計算表面保護膜的硬挺度衰減率。在一個實施例中，在步驟S4中當觀察到表面保護膜的硬挺度發生下降後的硬挺度變化的測量時間（硬挺度衰減時間）可以是例如1~5秒。Then in step S3, start to apply pressure to the cylindrical sample 102 at a pressing speed of, for example, 130 mm/min, and stop after pressing down until the cylindrical sample 102 has a second height h2, and measure the stiffness of the surface protection film over time The range of the second height is, for example, 5-60 mm. Regarding the selection of the second height h2, if the second height is too large, the deformation of the sample will be small, although the stiffness of the sample will still decay, but the performance difference of each sample will be too small to be recognized; on the contrary, if the first If the second height is too small, the deformation of the sample will be large, but sometimes it will cause the sample to break and make the data difficult to interpret. In some embodiments, where the length of the sample 102 is 170 mm, the second height h2 may be, for example, 15 mm. Then in step S4 (not shown), when the stiffness of the surface protection film is observed to decrease for a period of time, the measurement is stopped, and the stiffness decay rate of the surface protection film is calculated using the change of the stiffness of the surface protection film over time. In one embodiment, the measurement time of the change in stiffness (stiffness decay time) after observing the decrease of the stiffness of the surface protection film in step S4 may be, for example, 1-5 seconds.

第2圖是根據一實施例，繪示了表面保護膜硬挺度對時間的關係之實際量測的圖表。在這個實施例中，以130mm/min的下壓速度對筒狀樣品施壓，將筒狀樣品從80mm的第一高度下壓至具有15mm的第二高度後停止。如第2圖所示，表面保護膜在開始下壓之後約30秒達到對應第二高度的約350N/25mm的最大硬挺度M，接著停止向下施壓。參照第2圖的硬挺度衰減區A，表面保護膜在經歷最大硬挺度M後開始硬挺度衰減，從最大硬挺度M時的約350N/25mm衰減到5秒後的約250N/25mm，並且在表面保護膜的硬挺度隨著時間衰減時測量表面保護膜的硬挺度變化一段時間。在一些實施例中，如第2圖所示，上述測量時間是例如5秒。FIG. 2 is a graph illustrating actual measurements of the stiffness of a surface protection film versus time, according to one embodiment. In this example, the cylindrical sample was pressed at a pressing speed of 130 mm/min, and the cylindrical sample was pressed down from a first height of 80 mm to a second height of 15 mm and then stopped. As shown in FIG. 2 , the surface protection film reaches the maximum stiffness M corresponding to the second height of about 350N/25mm about 30 seconds after starting to press down, and then stops pressing down. Referring to the stiffness decay area A in Figure 2, the surface protection film begins to decay in stiffness after experiencing the maximum stiffness M, from about 350N/25mm at the maximum stiffness M to about 250N/25mm after 5 seconds, and at Stiffness of Surface Protective Film Over Time Decay Measures the change in stiffness of a surface protective film over time. In some embodiments, as shown in FIG. 2, the measurement time is, for example, 5 seconds.

表面保護膜的硬挺度衰減率由以下式（1）所計算： 式（1）：硬挺度衰減率=（最大硬挺度 − 反應後硬挺度）÷ 最大硬挺度。 其中反應後硬挺度為最大硬挺度產生後經過n秒時所截取的硬挺度，n可以是例如1~5。舉例而言，在第2圖的實施例中，以最大硬挺度M（約350mN/25mm）產生後經過5秒時所截取的硬挺度（約250mN/25mm）所計算出的硬挺度衰減率為（350－250）÷ 350=0.286 × 100%=28.6%。 The stiffness attenuation rate of the surface protection film is calculated by the following formula (1): Formula (1): Stiffness attenuation rate = (maximum stiffness − post-reaction stiffness) ÷ maximum stiffness. Wherein, the post-reaction stiffness is the stiffness intercepted when n seconds have elapsed after the maximum stiffness is produced, and n can be, for example, 1-5. For example, in the embodiment shown in Figure 2, the stiffness decay rate calculated from the stiffness (about 250mN/25mm) intercepted 5 seconds after the maximum stiffness M (about 350mN/25mm) is generated (350－250) ÷ 350=0.286 × 100%=28.6%.

作為表面保護膜的抗雲紋性能，評估表面保護膜所製成的面板是否有雲紋產生，可透過評估雲紋步驟，包含：首先可將表面保護膜貼合至偏光膜上，所述偏光膜，係用以將通過的光（具有任一方向之極化光）轉換成特定方向之偏極光之膜。偏光膜可採用已知的金屬偏光膜、碘系偏光膜、染料系偏光膜、聚乙烯偏光膜等。偏光膜的材料可為聚乙烯醇（PVA）樹脂膜，聚乙烯醇膜可藉由皂化聚醋酸乙烯樹脂製得。聚醋酸乙烯樹脂的例子包括醋酸乙烯之單聚合物，即聚醋酸乙烯，以及醋酸乙烯之共聚合物和其他能與醋酸乙烯進行共聚合之單體。其他能與醋酸乙烯進行共聚合之單體的例子包括不飽和羧酸（例如丙烯酸、甲基丙烯酸、丙烯酸乙酯、正丙烯酸丙酯、甲基丙烯酸甲酯）、烯烴（例如乙烯、丙烯、1-丁烯、2-甲丙烯）、乙烯醚（例如乙基乙烯醚、甲基乙烯醚、正丙基乙烯醚、異丙基乙烯醚）、不飽和磺酸（例如乙烯基磺酸、乙烯基磺酸鈉）等。As the anti-moiré performance of the surface protection film, to evaluate whether the panel made of the surface protection film has moiré, the step of evaluating the moire can include: firstly, the surface protection film can be bonded to the polarizing film, and the polarizing Film is a film used to convert passing light (polarized light in any direction) into polarized light in a specific direction. As the polarizing film, known metal polarizing films, iodine-based polarizing films, dye-based polarizing films, and polyethylene polarizing films can be used. The material of the polarizing film can be polyvinyl alcohol (PVA) resin film, and the polyvinyl alcohol film can be made by saponifying polyvinyl acetate resin. Examples of polyvinyl acetate resins include monopolymers of vinyl acetate, ie, polyvinyl acetate, and copolymers of vinyl acetate and other monomers that can be copolymerized with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g. acrylic acid, methacrylic acid, ethyl acrylate, n-propyl acrylate, methyl methacrylate), olefins (e.g. ethylene, propylene, 1 -butene, 2-methpropylene), vinyl ethers (such as ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acids (such as vinyl sulfonic acid, vinyl sodium sulfonate), etc.

上述偏光膜材料例如使用聚乙烯醇（polyvinyl alcohol，PVA）薄膜等其他光學膜層所構成的積體層以製備偏光板，接著參照第3A圖，將偏光板302貼合至顯示面板304（以下合稱為面板），其中顯示面板304的後方附有作為發光源的背光模組306。在一些實施例中，偏光板的結構可以包括各種膜層，由上到下依序為例如：表面保護膜、黏著層、第一保護層（材料例如為三醋酸纖維素薄膜）、作為偏光材料的聚乙烯醇薄膜、第二保護層（材料例如為三醋酸纖維素薄膜）、黏著層、離型膜（release film）等，但在本揭露中用於評估面板是否有雲紋產生的偏光板的結構與材料並非限定於此，例如可省略第一及/或第二保護層，或使用其他常用材料。The aforementioned polarizing film material, for example, uses a build-up layer composed of polyvinyl alcohol (polyvinyl alcohol, PVA) film and other optical film layers to prepare a polarizing plate, and then referring to FIG. referred to as a panel), where a backlight module 306 as a light source is attached behind the display panel 304 . In some embodiments, the structure of the polarizing plate can include various film layers, such as: surface protection film, adhesive layer, first protective layer (material such as triacetate cellulose film), as a polarizing material A polyvinyl alcohol film, a second protective layer (material such as a triacetate cellulose film), an adhesive layer, a release film (release film), etc., but in this disclosure, it is used to evaluate whether the panel has moiré. The structure and material are not limited thereto, for example, the first and/or second protective layer can be omitted, or other commonly used materials can be used.

在將偏光板302貼合至顯示面板304後，以發光模組306發射一光源以進行點燈檢查，利用配置於偏光板302與顯示面板304的前方距離D處（例如約1m處）的相機308擷取光源穿透偏光板302的影像，並確認影像中色度（或亮度）不均勻的位置及色度均勻的位置，此步驟可經由人員目視確認，再進一步比對色度均勻的位置與不均勻的位置之RGB色碼。After the polarizer 302 is attached to the display panel 304, a light source is emitted by the light emitting module 306 for lighting inspection, and a camera arranged at a distance D (for example, about 1 m) in front of the polarizer 302 and the display panel 304 is used. 308 captures the image of the light source passing through the polarizer 302, and confirms the position of uneven chromaticity (or brightness) and the position of uniform chromaticity in the image. This step can be visually confirmed by personnel, and then further compared with the position of uniform chromaticity RGB color codes with uneven positions.

關於RGB色碼的比對方式，首先參照第3B圖。第3B圖是根據一些實施例，對面板進行點燈檢查的結果的影像，其中可以確認到亮度不均勻的光從偏光板穿透，藉此找出亮度不均處以及亮度均勻處之RGB色碼，並且將RGB色碼具有最大值和最小值處分別定義為亮度不均位置P1（RGB色碼為R1、G1、B1）和亮度均勻位置P2（RGB色碼為R2、G2、B2），上述RGB色碼的數值為：√((R) 2+(G) 2+(B) 2)，其中R、G、B分別為亮度測量處之RGB色碼。接著，藉由以下式（2）來計算面板的亮度不均勻度： 式（2）：亮度不均勻度=√((R1－R2) 2+(G1－G2) 2+(B1－B2) 2)。 Regarding the way of comparing the RGB color codes, first refer to Figure 3B. Fig. 3B is an image of the result of lighting inspection on the panel according to some embodiments, in which it can be confirmed that the light with uneven brightness penetrates through the polarizer, so as to find out the RGB colors of the uneven brightness and the uniform brightness Code, and the RGB color code has the maximum value and the minimum value respectively defined as uneven brightness position P1 (RGB color code is R1, G1, B1) and brightness uniform position P2 (RGB color code is R2, G2, B2), The value of the above RGB color code is: √((R) 2 +(G) 2 +(B) 2 ), where R, G, and B are the RGB color codes at the luminance measurement location. Then, the brightness unevenness of the panel is calculated by the following formula (2): Formula (2): Brightness unevenness=√((R1－R2) 2 +(G1－G2) 2 +(B1－B2) 2 ).

面板雲紋的評估是基於以下基準：嚴重（X）、輕微（Δ）、及正常（O）。上述基準是藉由面板的亮度不均勻度來定義，例如，可以在面板的亮度不均勻度為110以上時，定義面板雲紋的評估結果為嚴重（X），即容易產生雲紋；在面板的亮度不均勻度為50~110時，定義面板雲紋的評估結果為輕微（Δ），即在可接受範圍產生些微雲紋；在面板的亮度不均勻度為50以下時，定義面板雲紋的評估結果為正常（O），即不產生雲紋。Evaluation of panel moiré is based on the following benchmarks: severe (X), slight (Δ), and normal (O). The above benchmarks are defined by the brightness unevenness of the panel. For example, when the brightness unevenness of the panel is above 110, the evaluation result of the moiré on the panel can be defined as serious (X), that is, moiré is easy to occur; When the brightness unevenness of the panel is 50~110, the evaluation result of the panel moiré is defined as slight (Δ), that is, a slight moiré is produced in the acceptable range; when the brightness unevenness of the panel is below 50, the panel moiré is defined as The evaluation result of is normal (O), that is, no moiré is produced.

以下針對各種用於偏光板的表面保護膜材料的樣品進行硬挺度衰減率的測試，其中分別使用最大硬挺度產生後經過1秒、3秒、及5秒時所截取的硬挺度作為反應後硬挺度，用於計算硬挺度衰減率。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較硬挺度衰減率測試及點燈檢查的結果。其結果表示於以下表1。藉此，可以使用表面保護膜的硬挺度衰減率作為指標，評估表面保護膜的抗雲紋特性。The stiffness attenuation rate is tested for various samples of surface protective film materials used for polarizing plates in the following, where the stiffness intercepted after 1 second, 3 seconds, and 5 seconds after the maximum stiffness is generated is used as the post-reaction stiffness degree, used to calculate the stiffness decay rate. Then use the panel including the above-mentioned various surface protection film materials to conduct a lighting inspection to observe whether there is any moiré, and compare the results of the stiffness decay rate test and the lighting inspection. The results are shown in Table 1 below. Thereby, the anti-moire property of the surface protection film can be evaluated using the stiffness decay rate of the surface protection film as an index.

表1 樣品編號 硬挺度衰減率（%）（1秒） 硬挺度衰減率（%）（3秒） 硬挺度衰減率（%）（5秒） 亮度不均勻度 面板雲紋評估 1-1 6.3 15.7 20.4 194 X 1-2 6.2 14.6 21.8 189 X 1-3 6.5 15.3 20.9 141 X 1-4 1.4 2.9 4.7 83 Δ 1-5 1.3 2.7 4.4 43 O 1-6 0.5 1.1 1.8 21 O 1-7 0.4 1.1 1.7 17 O 1-8 0.5 1.2 1.9 24 O Table 1 Sample serial number Stiffness decay rate (%) (1 second) Stiffness decay rate (%) (3 seconds) Stiffness decay rate (%) (5 seconds) Brightness unevenness Panel Moiré Evaluation 1-1 6.3 15.7 20.4 194 x 1-2 6.2 14.6 21.8 189 x 1-3 6.5 15.3 20.9 141 x 1-4 1.4 2.9 4.7 83 Δ 1-5 1.3 2.7 4.4 43 o 1-6 0.5 1.1 1.8 twenty one o 1-7 0.4 1.1 1.7 17 o 1-8 0.5 1.2 1.9 twenty four o

由表1可以得知，硬挺度衰減率較低的表面保護膜樣品所製造出的面板具有較低的亮度不均勻度，較不容易產生雲紋。由表1中的測試結果可以確認到，在使用最大硬挺度產生後經過1秒、3秒、及5秒時所截取的硬挺度作為反應後硬挺度，用於計算硬挺度衰減率時，硬挺度衰減率分別為1.3%、2.7%、及4.4%以下的表面保護膜樣品所製造的面板具有50以下的亮度不均勻度，因此具有正常（O）的雲紋評估結果，無亮度不均勻的問題，即不產生雲紋；而硬挺度衰減率分別為1.4%、2.9%、及4.7%以上的表面保護膜樣品所製造的面板具有50以上的亮度不均勻度，因此具有嚴重（X）或輕微（Δ）的雲紋評估結果，可以確認到亮度不均勻的光從面板穿透，即硬挺度衰減率較高的表面保護膜樣品所製造出的面板較容易產生雲紋。依據雲紋評估結果，顯示表面保護膜樣品硬挺度衰減率小於4.7%較不易產生雲紋；更佳的表面保護膜樣品硬挺度衰減率小於4.4%不產生雲紋，具有較佳的抗雲紋特性。It can be seen from Table 1 that the panel manufactured by the surface protective film sample with a lower stiffness attenuation rate has lower brightness unevenness and is less prone to moiré. From the test results in Table 1, it can be confirmed that the stiffness intercepted after 1 second, 3 seconds, and 5 seconds after the maximum stiffness is used is used as the stiffness after the reaction, and when used to calculate the stiffness decay rate, the stiffness The panel manufactured by the surface protective film samples with the degree of attenuation rates below 1.3%, 2.7%, and 4.4% respectively has a brightness unevenness of less than 50, so it has a normal (O) moiré evaluation result, and there is no brightness unevenness The problem is that there is no moiré; and the panels manufactured by the surface protective film samples with the stiffness attenuation rates of 1.4%, 2.9%, and 4.7% or more have a brightness unevenness of more than 50, so they have serious (X) or Slight (Δ) moiré evaluation results can confirm that light with uneven brightness penetrates through the panel, that is, the panel manufactured by the surface protective film sample with a higher stiffness attenuation rate is more likely to produce moiré. According to the moiré evaluation results, it shows that the stiffness attenuation rate of the surface protective film sample is less than 4.7%, and it is less likely to produce moiré; the better surface protective film sample has a stiffness attenuation rate of less than 4.4%, which does not produce moiré, and has better anti-moiré characteristic.

如上所述，本揭露提供一種表面保護膜的評估方法，其中包括硬挺度衰減率量測步驟以取得表面保護膜的硬挺度衰減率，並且將硬挺度衰減率作為指標，用於評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As mentioned above, the present disclosure provides an evaluation method of a surface protection film, which includes a stiffness decay rate measurement step to obtain the stiffness decay rate of the surface protection film, and uses the stiffness decay rate as an index for evaluating various surface protection Anti-moiré properties of film samples. Therefore, this anti-moiré evaluation method can be used to evaluate whether various surface protection film materials used for polarizing plates are prone to produce moiré phenomenon of uneven brightness after the optical display device is manufactured.

除了利用硬挺度衰減率作為表面保護膜的抗雲紋特性的指標外，由於表面保護膜受到延伸而產生形變後會發生形變恢復，造成表面保護膜滑動的現象並產生偏光板變形，使得所製造的面板會容易產生雲紋，造成顯示器亮度不均勻。為了降低偏光板的變形，需要採用低滑動性的表面保護膜。因此，在一些實施例中，可以在表面保護膜的評估方法中進一步加入滑移量量測步驟，並且利用表面保護膜相對於基板的滑移量作為指標，評估表面保護膜的抗雲紋特性。以下將進一步詳細說明滑移量的量測方式的實施例。應當理解的是，本發明所揭露的滑移量的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整滑移量量測步驟中所使用的參數。In addition to using the stiffness attenuation rate as an indicator of the anti-moiré characteristics of the surface protection film, the deformation recovery will occur after the surface protection film is stretched and deformed, resulting in the sliding phenomenon of the surface protection film and the deformation of the polarizer, making the manufactured The panel is prone to moiré, resulting in uneven brightness of the display. In order to reduce the deformation of the polarizing plate, it is necessary to use a surface protection film with low slipperiness. Therefore, in some embodiments, the slippage measurement step can be further added in the evaluation method of the surface protection film, and the slippage of the surface protection film relative to the substrate can be used as an index to evaluate the anti-moiré characteristic of the surface protection film . Embodiments of the measurement method of the slippage will be further described in detail below. It should be understood that the slip measurement method disclosed in the present invention is not limited to the following parameters, and those skilled in the art can freely adjust the parameters used in the slip measurement step.

在本揭露的表面保護膜之滑移量量測步驟前可先進行樣品前處理。在一些實施例的樣品前處理中，首先可將不含表面保護膜的偏光板（例如長度15cm，寬度5cm）貼合在一載板上，其中載板的材料例如是玻璃或塑膠等承載材料，而作為用於滑移量量測的基板。接著，使用適當重量（例如2kg）的滾輪將表面保護膜（長度15cm，寬度2.5cm）藉由黏著層貼合在上述作為基板的表面。在一實施例中，亦可先將表面保護膜與偏光板藉由黏著層先行貼合後，再將之貼合在基板的表面上。黏著層的材料與本說明書前段揭露相同，在此不再贅述。Before the step of measuring the slip of the surface protective film of the present disclosure, sample pretreatment may be performed first. In the sample pretreatment in some embodiments, firstly, a polarizing plate (for example, length 15cm, width 5cm) without surface protection film can be pasted on a support plate, wherein the material of the support plate is such as glass or plastic. , and as a substrate for slip measurement. Next, a surface protection film (length 15 cm, width 2.5 cm) is pasted on the surface of the above-mentioned substrate by using a roller with an appropriate weight (for example, 2 kg). In one embodiment, the surface protection film and the polarizing plate can also be bonded first through an adhesive layer, and then bonded on the surface of the substrate. The material of the adhesive layer is the same as that disclosed in the previous paragraph of this specification, and will not be repeated here.

在一實施例中，表面保護膜的面積小於或等於基板及/或偏光板的表面。上述表面保護膜的材料並未特別限定，表面保護膜的材料可為透明性、機械強度、熱穩定性、水分阻隔性等優良之熱可塑性樹脂，例如可包括纖維素系樹脂、丙烯酸系樹脂、非結晶性聚烯烴系樹脂、聚酯系樹脂、聚碳酸酯系樹脂、或上述之任意組合。纖維素系樹脂是指纖維素中部分的羥基被乙酸酯化之樹脂，或是一部分被乙酸酯化、一部分被其他酸酯化之混合酯。纖維素系樹脂較佳為纖維素酯系樹脂，更佳為乙醯基纖維素系樹脂，例如三乙醯基纖維素、二乙醯基纖維素、纖維素乙酸酯丙酸酯、纖維素乙酸酯丁酸酯等。被充分酯化的纖維素稱三醋酸纖維素（triacetate cellulose，TAC）、丙烯酸樹脂膜、聚芳香羥樹脂膜、聚醚樹脂膜、環聚烯烴樹脂膜（例如聚冰片烯樹脂膜）。聚碳酸酯系樹脂為例如由碳酸與二醇或雙酚所形成的聚酯，例如聚對苯二甲酸乙二醇酯（polyethylene Terephthalate，PET）、聚丙稀（polypropylene，PP）、聚乙烯（polyethylene，PE）。非結晶性聚烯烴系樹脂為例如環狀烯烴單體（共）聚合物（cyclo olefin (co)polymers，COC/COP），由降冰片烯、環戊二烯、二環戊二烯、四環十二碳烯等開環聚合物，或與烯烴類之共聚合物所構成、聚碳酸酯（polycarbonate，PC）以及上述任意組合所組成的一族群。除此之外，保護層材料還可以是例如（甲基）丙烯酸系、胺基甲酸酯系、丙烯酸胺基甲酸酯系、環氧系、聚矽氧系等熱硬化性樹脂或紫外線硬化型樹脂。此外，亦可進一步對上述表面保護膜的材料實行表面處理，例如，抗眩光處理、抗反射處理、硬塗處理、帶電防止處理或抗污處理等。In one embodiment, the area of the surface protection film is smaller than or equal to the surface of the substrate and/or the polarizer. The material of the surface protection film is not particularly limited. The material of the surface protection film can be a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, etc., for example, it can include cellulose-based resin, acrylic resin, Amorphous polyolefin resin, polyester resin, polycarbonate resin, or any combination of the above. Cellulose-based resins refer to resins in which part of the hydroxyl groups in cellulose are esterified with acetate, or mixed esters in which part is esterified with acetate and part is esterified with other esters. The cellulose resin is preferably a cellulose ester resin, more preferably an acetyl cellulose resin, such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose Acetate butyrate etc. Fully esterified cellulose is called triacetate cellulose (TAC), acrylic resin film, polyaryl hydroxy resin film, polyether resin film, cyclopolyolefin resin film (such as polybornene resin film). Polycarbonate resins are, for example, polyesters formed from carbonic acid and diols or bisphenols, such as polyethylene terephthalate (polyethylene Terephthalate, PET), polypropylene (polypropylene, PP), polyethylene (polyethylene , PE). Amorphous polyolefin-based resins are, for example, cyclo olefin (co)polymers (COC/COP), composed of norbornene, cyclopentadiene, dicyclopentadiene, tetracycline Ring-opening polymers such as dodecene, or copolymers with olefins, polycarbonate (polycarbonate, PC), and a group of any combination of the above. In addition, the protective layer material can also be thermosetting resins such as (meth)acrylic, urethane, acrylic urethane, epoxy, polysiloxane, etc., or ultraviolet curing resins. type resin. In addition, surface treatment may be further performed on the material of the above-mentioned surface protection film, for example, anti-glare treatment, anti-reflection treatment, hard-coat treatment, anti-static treatment, or anti-fouling treatment.

在一特定實施例中，可以使用聚對苯二甲酸乙二酯（PET）作為表面保護膜的材料。貼合完畢後，可將樣品放置於溫度25℃且濕度55%的環境下1天，使表面保護膜和偏光板及基板間的貼合更加牢固以成為滑移量量測的樣品。應當理解的是，在上述樣品前處理中，也可以使用其他尺寸的表面保護膜、偏光板、及玻璃進行量側。In a specific embodiment, polyethylene terephthalate (PET) may be used as the material of the surface protection film. After lamination, the sample can be placed in an environment with a temperature of 25°C and a humidity of 55% for 1 day to make the bonding between the surface protective film and the polarizer and the substrate more firm and become a sample for slip measurement. It should be understood that, in the above sample pretreatment, surface protection films, polarizers, and glasses of other sizes may also be used for measurement.

關於表面保護膜的滑移量量測步驟，在一些實施例中，使用拉伸試驗機（例如，島津製拉力AGX試驗機）以對表面保護膜樣品進行拉伸。首先將表面保護膜固定在拉伸試驗機上並記錄表面保護膜的位置，接著以一固定張力拉伸一固定時間，並且量測表面保護膜相對於基板及/或偏光板的表面的滑移量。在一些實施例中，上述拉伸條件為：以10~60N的張力拉伸0.5~3小時。在一些實施例中，表面保護膜相對於基板及偏光板的表面的滑移量係為相同，亦即只有表面保護膜相對於基板及偏光板的表面進行滑移，偏光板相對於基板不會有滑移（滑移量趨近為零）。Regarding the step of measuring the slippage of the surface protection film, in some embodiments, a tensile testing machine (for example, AGX tensile testing machine manufactured by Shimadzu) is used to stretch the surface protection film sample. First fix the surface protection film on the tensile testing machine and record the position of the surface protection film, then stretch it with a fixed tension for a fixed time, and measure the slippage of the surface protection film relative to the surface of the substrate and/or polarizer quantity. In some embodiments, the above-mentioned stretching conditions are: stretching with a tension of 10-60N for 0.5-3 hours. In some embodiments, the slippage of the surface protection film relative to the substrate and the surface of the polarizer is the same, that is, only the surface protection film slips relative to the surface of the substrate and the polarizer, and the polarizer does not slide relative to the substrate. There is slippage (the amount of slippage approaches zero).

以下針對各種用於偏光板的表面保護膜材料的樣品進行滑移量的測試，其中使用30N的張力拉伸1小時，並且量測表面保護膜相對於基板的表面的滑移量。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較滑移量量測及點燈檢查的結果。其結果表示於以下表2。藉此，可以使用表面保護膜相對於基板的滑移量作為指標，評估表面保護膜的抗雲紋特性。The slippage test was performed on samples of various surface protection film materials for polarizing plates, in which they were stretched for 1 hour with a tension of 30 N, and the slippage of the surface protection film relative to the surface of the substrate was measured. Then, the panel including the above-mentioned various surface protection film materials is used for lighting inspection to observe whether there is moiré, and compare the results of slip measurement and lighting inspection. The results are shown in Table 2 below. Thereby, the anti-moiré characteristic of the surface protection film can be evaluated using the slip amount of the surface protection film with respect to the substrate as an index.

表2 樣品編號 固定張力（N） 表面保護膜滑移量（mm） 固定張力*表面保護膜滑移量（N*mm） 亮度不均勻度 面板雲紋評估 2-1 30 50 1500 201 X 2-2 30 25 750 181 X 2-3 30 10 300 168 X 2-4 30 8 240 154 X 2-5 30 5 150 157 X 2-6 30 2 60 153 X 2-7 30 1 30 48 O 2-8 30 0.5 15 42 O 2-9 30 0.3 9 34 O 2-10 30 0.1 3 28 O 2-11 30 0 0 20 O Table 2 Sample serial number Fixed tension (N) Slippage of surface protective film (mm) Fixed tension*slippage of surface protective film (N*mm) Brightness unevenness Panel Moiré Evaluation 2-1 30 50 1500 201 x 2-2 30 25 750 181 x 2-3 30 10 300 168 x 2-4 30 8 240 154 x 2-5 30 5 150 157 x 2-6 30 2 60 153 x 2-7 30 1 30 48 o 2-8 30 0.5 15 42 o 2-9 30 0.3 9 34 o 2-10 30 0.1 3 28 o 2-11 30 0 0 20 o

由表2的測試結果可以確認到，當表面保護膜滑移量大於2mm時，具有110以上的亮度不均勻度，即在進行對面板貼合時容易產生面板雲紋，造成顯示器的亮度不均勻。較佳的表面保護膜滑移量小於1mm，不產生雲紋，具有較佳的抗雲紋特性。應當理解的是，雖然在表2的實施例中是使用30N的固定張力進行拉伸，並且根據量測結果，以表面保護膜滑移量大於2mm作為是否產生雲紋的評估指標，然而在其他實施例中，也可以使用不同大小的固定張力進行滑移量的量測。因此在本揭露之表面保護膜的評估方法的其他實施例中，不僅可以使用表面保護膜滑移量作為面板是否產生雲紋的評估指標，也可以使用固定張力大小與表面保護膜滑移量的積作為評估指標，例如來自固定張力（30N）乘以表面保護膜滑移量（2mm）的60（N*mm）。From the test results in Table 2, it can be confirmed that when the slippage of the surface protective film is greater than 2mm, it has a brightness unevenness of more than 110, that is, panel moiré is likely to occur when the panel is bonded, resulting in uneven brightness of the display . The slippage of the preferred surface protection film is less than 1mm, no moiré occurs, and it has better anti-moiré characteristics. It should be understood that although in the embodiment of Table 2, a fixed tension of 30N is used for stretching, and according to the measurement results, the slippage of the surface protective film is greater than 2 mm as an evaluation index for whether moire is generated, but in other In an embodiment, different fixed tensions can also be used to measure the slippage. Therefore, in other embodiments of the evaluation method of the surface protection film disclosed in the present disclosure, not only the slippage of the surface protection film can be used as the evaluation index of whether moiré occurs on the panel, but also the value of the fixed tension and the slippage of the surface protection film can be used. As an evaluation index, for example, 60 (N*mm) from the fixed tension (30N) multiplied by the slippage of the surface protective film (2mm).

如上所述，本揭露提供另一種表面保護膜的評估方法，其中包括滑移量量測步驟以取得表面保護膜相對於基板的滑移量，並且將滑移量作為指標，用於進一步評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As mentioned above, the present disclosure provides another evaluation method of a surface protection film, which includes a slip measurement step to obtain the slip of the surface protection film relative to the substrate, and uses the slip as an index for further evaluation of various Anti-moiré properties of surface protection film samples. Therefore, this anti-moiré evaluation method can be used to evaluate whether various surface protection film materials used for polarizing plates are prone to produce moiré phenomenon of uneven brightness after the optical display device is manufactured.

除了利用硬挺度衰減率與滑移量作為表面保護膜的抗雲紋特性的指標外，由於表面保護膜張力加大可能會造成表面保護膜變形並產生厚度不均，使得所製造的面板會容易產生雲紋，造成顯示器亮度不均勻。為了解決上述問題，需要使用受到張力延伸下，形變率較小之表面保護膜。因此，在一些實施例中，可以在表面保護膜的評估方法中進一步加入形變率量測步驟，並且利用表面保護膜的形變率作為指標，評估表面保護膜的抗雲紋特性。以下將進一步詳細說明形變率的量測方式的實施例。應當理解的是，本發明所揭露的形變率的量測方式並非限於下述參數，所屬技術領域中具有通常知識者可以自由調整形變率量測步驟中所使用的參數。In addition to using the stiffness attenuation rate and slippage as indicators of the anti-moiré characteristics of the surface protection film, the increase in the tension of the surface protection film may cause deformation of the surface protection film and uneven thickness, making the manufactured panels easy to Moiré is generated, resulting in uneven brightness of the display. In order to solve the above problems, it is necessary to use a surface protection film with a small deformation rate under tension extension. Therefore, in some embodiments, a deformation rate measurement step can be further added to the evaluation method of the surface protection film, and the deformation rate of the surface protection film can be used as an index to evaluate the anti-moire property of the surface protection film. Embodiments of the measurement method of the deformation rate will be further described in detail below. It should be understood that the method for measuring the deformation rate disclosed in the present invention is not limited to the following parameters, and those skilled in the art can freely adjust the parameters used in the deformation rate measurement step.

在本揭露的表面保護膜的形變率量測步驟之前可先進行樣品前處理，將表面保護膜裁切成具有適合的尺寸的矩形，例如在一個實施例中，表面保護膜的尺寸可以是長度15cm且寬度5cm，其中長度方向為表面保護膜用於拉伸的加工方向（machine direction，MD）。Before the deformation rate measurement step of the surface protection film of the present disclosure, sample pretreatment can be carried out, and the surface protection film is cut into a rectangle with a suitable size. For example, in one embodiment, the size of the surface protection film can be length 15 cm and a width of 5 cm, where the length direction is the machine direction (MD) used for stretching of the surface protection film.

接著參照第4A、4B圖，第4A、4B圖是根據一些實施例，繪示了表面保護膜的形變率量測步驟的示意圖。在一些實施例中，使用拉伸試驗機（例如，島津製拉力AGX試驗機）以對表面保護膜樣品進行拉伸，其中拉伸力量需設定在表面保護膜材料的彈性區域內。如第4A圖所示在進行拉伸之前，可先量測表面保護膜樣品402的原始長邊長度L0與原始短邊長度W0，並且將樣品402固定於拉伸試驗機的夾具404上，其中夾具404在樣品402上的固定位置是配置為使其能在表面保護膜樣品402的加工方向MD上進行拉伸。Next, refer to FIG. 4A and FIG. 4B . FIG. 4A and FIG. 4B are schematic diagrams illustrating the steps of measuring the deformation rate of the surface protection film according to some embodiments. In some embodiments, a tensile testing machine (for example, Shimadzu tensile AGX testing machine) is used to stretch the surface protection film sample, wherein the tensile force needs to be set within the elastic region of the surface protection film material. As shown in Figure 4A, before stretching, the original long side length L0 and the original short side length W0 of the surface protection film sample 402 can be measured, and the sample 402 is fixed on the clamp 404 of the tensile testing machine, wherein The fixed position of the clamp 404 on the sample 402 is configured such that it can be stretched in the machine direction MD of the surface protection film sample 402 .

接著參照第4B圖，在表面保護膜樣品402的長度方向以一拉伸速度拉伸表面保護膜至一固定張力，並且在這個固定張力維持一拉伸時間。在上述拉伸時間後量測表面保護膜拉伸後的長邊長度L1與拉伸後的短邊長度W1的長度以求出表面保護膜在長邊與短邊經過拉伸後的長度變化量L1－L0、W0－W1。應當理解的是，在本揭露的實施例中並未特別限定形變率量測步驟中所使用的拉伸速度、固定張力、以及拉伸時間，本發明所屬技術領域中具有通常知識者可以根據作為樣品的表面保護膜的材料不同而選擇適合的製程參數，例如上述拉伸速度可以是1~20mm/min，固定張力可以是130~180N。在本揭露的一些實施例中，使用5mm/min的速度進行拉伸，當張力達到160N，持續以160N的張力拉伸2小時。在本揭露的另外一些實施例中，使用5mm/min的速度進行拉伸，當張力達到120N，持續以120N的張力拉伸2小時。Next, referring to FIG. 4B , stretch the surface protection film to a fixed tension at a stretching speed in the longitudinal direction of the surface protection film sample 402 , and maintain a stretching time at the constant tension. After the above stretching time, measure the length of the long side length L1 after stretching and the short side length W1 after stretching of the surface protection film to find the length change of the surface protection film after stretching on the long side and short side L1-L0, W0-W1. It should be understood that the stretching speed, fixed tension, and stretching time used in the deformation rate measurement step are not particularly limited in the embodiments of the present disclosure, and those with ordinary knowledge in the technical field of the present invention can use it as The material of the surface protective film of the sample is different and the appropriate process parameters are selected. For example, the above-mentioned stretching speed can be 1~20mm/min, and the fixed tension can be 130~180N. In some embodiments of the present disclosure, stretching is performed at a speed of 5 mm/min, and when the tension reaches 160 N, the stretching is continued at a tension of 160 N for 2 hours. In some other embodiments of the present disclosure, stretching is performed at a speed of 5 mm/min, and when the tension reaches 120 N, the stretching is continued at a tension of 120 N for 2 hours.

表面保護膜的形變率由以下式（3）所計算： 式（3）：形變率=ey/ex=（（W0－W1）/W0）/（（L1－L0）/L0） 其中ey為短邊長度變化量W0－W1除以拉伸前的原始短邊長度W0，ex為長邊長度變化量L1－L0除以拉伸前的原始長邊長度L0。 The deformation rate of the surface protection film is calculated by the following formula (3): Formula (3): Deformation rate=ey/ex=((W0－W1)/W0)/((L1－L0)/L0) Among them, ey is the short side length variation W0-W1 divided by the original short side length W0 before stretching, and ex is the long side length change L1-L0 divided by the original long side length L0 before stretching.

以下針對各種用於偏光板的表面保護膜材料的樣品進行形變率的測試，其中分別使用120N及160N的拉伸力量對各種表面保護膜樣品進行形變率的量測。接著再以包括上述各種表面保護膜材料的面板進行點燈檢查，觀察是否有雲紋產生，並且比較形變率量測及點燈檢查的結果。其結果表示於以下表3。藉此，可以使用表面保護膜的形變率作為指標，評估表面保護膜的抗雲紋特性。The deformation rate of various samples of surface protection film materials used for polarizing plates is tested as follows, wherein the deformation rates of various surface protection film samples are measured using tensile forces of 120N and 160N respectively. Then, the panel including the above-mentioned various surface protection film materials is used for lighting inspection to observe whether there is moiré, and compare the results of deformation rate measurement and lighting inspection. The results are shown in Table 3 below. Thereby, the anti-moire property of the surface protection film can be evaluated using the deformation rate of the surface protection film as an index.

表3 樣品編號 拉伸力量（N） 形變率ey/ex 長邊形變率ex（%） 短邊形變率ey（%） 亮度不均勻度 面板雲紋評估 3-1 120 0.42 0.12 0.050 164 X 3-2 120 0.33 0.09 0.030 158 X 3-3 120 0.28 0.08 0.022 105 Δ 3-4 120 0.18 0.08 0.014 28 O 3-5 160 0.50 0.14 0.070 193 X 3-6 160 0.30 0.11 0.033 151 X 3-7 160 0.25 0.10 0.025 96 Δ 3-8 160 0.15 0.11 0.017 31 O table 3 Sample serial number Tensile strength (N) Deformation rate ey/ex Long side deformation rate ex (%) Short side deformation rate ey (%) Brightness unevenness Panel Moiré Evaluation 3-1 120 0.42 0.12 0.050 164 x 3-2 120 0.33 0.09 0.030 158 x 3-3 120 0.28 0.08 0.022 105 Δ 3-4 120 0.18 0.08 0.014 28 o 3-5 160 0.50 0.14 0.070 193 x 3-6 160 0.30 0.11 0.033 151 x 3-7 160 0.25 0.10 0.025 96 Δ 3-8 160 0.15 0.11 0.017 31 o

由表3可以得知，形變率較低的表面保護膜樣品所製造出的面板較不容易產生雲紋。由表3中的測試結果可以確認到，在使用120N及160N的拉伸力量，用於量測形變率時，形變率分別為0.18及0.15以下的表面保護膜樣品所製造的面板之亮度不均勻度為50以下，具有正常（O）的雲紋評估結果，無亮度不均勻的問題；而形變率分別為0.28及0.25以上的表面保護膜樣品所製造的面板之亮度不均勻度為50以上，具有嚴重（X）或輕微（Δ）的雲紋評估結果，可以確認到亮度不均勻的光從面板穿透，即形變率較高的表面保護膜樣品所製造出的面板較容易產生雲紋。依據雲紋評估結果，顯示表面保護膜樣品形變率小於0.28較不易產生雲紋；更佳的表面保護膜樣品形變率小於0.18不產生雲紋，具有較佳的抗雲紋特性。It can be seen from Table 3 that the panel manufactured by the surface protective film sample with a lower deformation rate is less likely to produce moiré. From the test results in Table 3, it can be confirmed that when the tensile forces of 120N and 160N are used to measure the deformation rate, the brightness of the panels manufactured by the surface protection film samples with the deformation rate below 0.18 and 0.15 respectively is not uniform. If the degree is below 50, it has a normal (O) moiré evaluation result, and there is no problem of uneven brightness; while the surface protection film samples with deformation rates of 0.28 and above 0.25 have a brightness unevenness of above 50, With severe (X) or slight (Δ) moiré evaluation results, it can be confirmed that light with uneven brightness penetrates through the panel, that is, the panel manufactured by the surface protection film sample with a higher deformation rate is more likely to produce moiré. According to the evaluation results of moire, it shows that the deformation rate of the surface protection film sample is less than 0.28, which is less likely to produce moiré; the better surface protection film sample has a deformation rate of less than 0.18 and does not produce moiré, which has better anti-moiré characteristics.

如上所述，本揭露提供另一種表面保護膜的評估方法，其中包括形變率量測步驟以取得表面保護膜的形變率，並且將形變率作為指標，用於進一步評估各種表面保護膜樣品的抗雲紋特性。藉此，這種抗雲紋評估方法可以用來評估各種用於偏光板的表面保護膜材料在製造光學顯示裝置後是否容易產生亮度不均勻的雲紋現象。As mentioned above, this disclosure provides another evaluation method of surface protection film, which includes a deformation rate measurement step to obtain the deformation rate of the surface protection film, and uses the deformation rate as an index for further evaluating the resistance of various surface protection film samples. Moiré characteristics. Therefore, this anti-moiré evaluation method can be used to evaluate whether various surface protection film materials used for polarizing plates are prone to produce moiré phenomenon of uneven brightness after the optical display device is manufactured.

應當理解的是，本領域中具有通常知識者可以單獨使用在本揭露中所提供的硬挺度衰減率量測步驟、滑移量量測步驟、或形變率量測步驟以評估表面保護膜的抗雲紋特性，也可以使用上述硬挺度衰減率量測步驟、滑移量量測步驟、以及形變率量測步驟的任意組合以綜合評估表面保護膜的抗雲紋特性。藉由同時以表面保護膜的硬挺度衰減率、滑移量、以及形變率等當中的複數個性質作為評估表面保護膜的抗雲紋特性的指標，可以使判斷表面保護膜樣品是否會產生雲紋的評估結果更加準確。It should be understood that those skilled in the art can use the stiffness decay rate measurement step, the slippage measurement step, or the deformation rate measurement step provided in the present disclosure alone to evaluate the resistance of the surface protection film. For the moiré characteristics, any combination of the aforementioned stiffness attenuation rate measurement steps, slippage measurement steps, and deformation rate measurement steps can also be used to comprehensively evaluate the anti-moiré characteristics of the surface protection film. By using the stiffness attenuation rate, slippage, and deformation rate of the surface protection film as indicators for evaluating the anti-moiré characteristics of the surface protection film at the same time, it is possible to judge whether the surface protection film sample will produce clouds. The assessment results of striae are more accurate.

雖然本發明以前述數個較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可做些許之更動與潤飾。因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。此外，每個申請專利範圍建構成一獨立的實施例，且各種申請專利範圍及實施例之組合皆介於本發明之範圍內。Although the present invention is disclosed above with the aforementioned several preferred embodiments, they are not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application. In addition, each claimed claim constitutes an independent embodiment, and combinations of various claimed claims and embodiments fall within the scope of the present invention.

102:樣品（筒狀樣品） 104,404:夾具 104-1:下部 104-2:上部 302:偏光板 304:顯示面板 306:背光模組 308:相機 402:樣品 A:硬挺度衰減區 D:距離 h1:第一高度 h2:第二高度 L:光 L0:原始長邊長度 L1:拉伸後的長邊長度 S1,S2,S3,S4:步驟 W0:原始短邊長度 W1:拉伸後的短邊長度 102: Sample (cylindrical sample) 104,404: Fixtures 104-1: lower part 104-2: upper part 302: polarizer 304: display panel 306:Backlight module 308: camera 402: sample A: Stiffness attenuation zone D: distance h1: first height h2: second height L: light L0: Original long side length L1: The length of the long side after stretching S1, S2, S3, S4: steps W0: original short side length W1: Short side length after stretching

以下將配合所附圖式詳述本揭露實施例。應注意的是，依據在業界的標準做法，各種特徵並未按照比例繪製且僅用以說明例示。事實上，可能任意地放大或縮小元件的尺寸，以清楚地表現出本揭露實施例的特徵。 第1圖是根據一些實施例，繪示了表面保護膜的硬挺度衰減率量測步驟的示意圖。 第2圖是根據一個實施例，繪示了表面保護膜硬挺度對時間的關係之實際量測的圖表。 第3A、3B圖是根據一些實施例，對面板進行點燈檢查的結果的影像。 第4A、4B圖是根據一些實施例，繪示了表面保護膜的形變率量測步驟的示意圖。 Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, in accordance with the standard practice in the industry, the various features are not drawn to scale and are used for illustrative purposes only. In fact, the dimensions of the elements may be arbitrarily expanded or reduced to clearly represent the features of the disclosed embodiments. FIG. 1 is a schematic diagram illustrating steps of measuring a stiffness decay rate of a surface protection film according to some embodiments. FIG. 2 is a graph illustrating actual measurements of surface protection film stiffness versus time, according to one embodiment. Figures 3A, 3B are images of the results of a light-up inspection of a panel, according to some embodiments. 4A and 4B are schematic diagrams illustrating the steps of measuring the deformation rate of the surface protection film according to some embodiments.

102:樣品(筒狀樣品) 102: Sample (cylindrical sample)

104:夾具 104: fixture

104-1:下部 104-1: lower part

104-2:上部 104-2: upper part

h1:第一高度 h1: first height

h2:第二高度 h2: second height

S1,S2,S3:步驟 S1, S2, S3: steps

Claims (11)

一種表面保護膜的評估方法，包括： 一硬挺度衰減率量測步驟，包括： 將一表面保護膜捲曲成一筒狀樣品後，固定於一夾具上，其中該筒狀樣品具有一第一高度； 下壓該筒狀樣品至一第二高度後停止，並且量測該表面保護膜隨時間的硬挺度變化；以及 由該表面保護膜隨時間的硬挺度變化計算該表面保護膜的硬挺度衰減率； 以該表面保護膜的硬挺度衰減率作為指標，評估該表面保護膜的抗雲紋特性；以及 一滑移量量測步驟，包括： 將該表面保護膜貼合在一基板的表面； 將該表面保護膜固定在一拉伸測試機上；以及 以一固定張力拉伸一拉伸時間，接著量測該表面保護膜相對於該基板的一滑移量；以及 以該表面保護膜相對於該基板的該滑移量作為指標，評估該表面保護膜的抗雲紋特性。 A method for evaluating a surface protective film, comprising: A stiffness decay rate measurement step, comprising: After curling a surface protection film into a cylindrical sample, fix it on a fixture, wherein the cylindrical sample has a first height; Stopping after depressing the cylindrical sample to a second height, and measuring the stiffness change of the surface protection film over time; and Calculate the stiffness decay rate of the surface protection film from the stiffness change of the surface protection film over time; Taking the stiffness attenuation rate of the surface protection film as an index to evaluate the anti-moiré characteristics of the surface protection film; and A slip measurement step, including: attaching the surface protection film to the surface of a substrate; Fixing the surface protection film on a tensile testing machine; and Stretching with a fixed tension for a stretching time, then measuring a slippage of the surface protection film relative to the substrate; and Using the slippage of the surface protection film relative to the substrate as an index, the anti-moire property of the surface protection film was evaluated. 如請求項1之表面保護膜的評估方法，其中更以該滑移量乘以該固定張力的積作為指標，評估該表面保護膜的抗雲紋特性。The method for evaluating a surface protection film according to claim 1, wherein the product of the slippage multiplied by the fixed tension is used as an index to evaluate the anti-moiré characteristic of the surface protection film. 如請求項1之表面保護膜的評估方法，其中更以該滑移量小於1mm作為指標。The evaluation method of the surface protection film as claimed in item 1, wherein the slippage is less than 1mm as the index. 如請求項1之表面保護膜的評估方法，其中該固定張力為10~60N；且/或其中該拉伸時間為0.5~3小時。The evaluation method of the surface protection film as claimed in item 1, wherein the fixed tension is 10-60N; and/or wherein the stretching time is 0.5-3 hours. 一種表面保護膜的評估方法，包括： 一硬挺度衰減率量測步驟，包括： 將一表面保護膜捲曲成一筒狀樣品後，固定於一夾具上，其中該筒狀樣品具有一第一高度； 下壓該筒狀樣品至一第二高度後停止，並且量測該表面保護膜隨時間的硬挺度變化；以及 由該表面保護膜隨時間的硬挺度變化計算該表面保護膜的硬挺度衰減率； 以該表面保護膜的硬挺度衰減率作為指標，評估該表面保護膜的抗雲紋特性；以及 一形變率量測步驟，包括： 將該表面保護膜裁切為一矩形，且量測該表面保護膜的長邊與短邊長度； 在該矩形的長邊方向以一拉伸速度拉伸該表面保護膜至一固定張力，並維持該固定張力拉伸一拉伸時間； 量測拉伸後的該表面保護膜的長邊與短邊長度；以及 由拉伸後的該表面保護膜的長邊與短邊長度計算該表面保護膜的形變率；以及 以該表面保護膜的形變率作為指標，評估該表面保護膜的抗雲紋特性。 A method for evaluating a surface protective film, comprising: A stiffness decay rate measurement step, comprising: After curling a surface protection film into a cylindrical sample, fix it on a fixture, wherein the cylindrical sample has a first height; Stopping after depressing the cylindrical sample to a second height, and measuring the stiffness change of the surface protection film over time; and Calculate the stiffness decay rate of the surface protection film from the stiffness change of the surface protection film over time; Taking the stiffness attenuation rate of the surface protection film as an index to evaluate the anti-moiré characteristics of the surface protection film; and A deformation rate measurement step, comprising: Cutting the surface protection film into a rectangle, and measuring the length of the long side and the short side of the surface protection film; Stretching the surface protection film to a fixed tension at a stretching speed in the long side direction of the rectangle, and maintaining the constant tension for a stretching time; Measuring the lengths of the long side and the short side of the surface protection film after stretching; and Calculate the deformation rate of the surface protection film from the length of the long side and the short side of the surface protection film after stretching; and Using the deformation rate of the surface protection film as an index, the anti-moire property of the surface protection film was evaluated. 如請求項5之表面保護膜的評估方法，其中該表面保護膜的形變率為ey/ex，ey為短邊長度變化量/拉伸前的短邊長度，ex為長邊長度變化量/拉伸前的長邊長度。Such as the evaluation method of the surface protection film of claim item 5, wherein the deformation rate of the surface protection film is ey/ex, ey is the change in length of the short side/the length of the short side before stretching, and ex is the change in length of the long side/stretched The length of the long side before stretching. 如請求項6之表面保護膜的評估方法，其中更以該表面保護膜的形變率小於0.28作為指標。The evaluation method of the surface protection film as claimed in item 6, wherein the deformation rate of the surface protection film is less than 0.28 as an index. 如請求項5之表面保護膜的評估方法，其中該拉伸速度為1~20mm/min；且/或其中該固定張力為130~180N。The evaluation method of the surface protection film as claimed in item 5, wherein the stretching speed is 1-20mm/min; and/or wherein the fixed tension is 130-180N. 如請求項1至8中任一項之表面保護膜的評估方法，更包括： 一評估雲紋步驟，該評估雲紋步驟評估該表面保護膜所製成的面板是否有雲紋產生，包括： 將該表面保護膜貼合至一偏光膜製成一偏光板； 將該偏光板貼合至一顯示面板，其中該顯示面板包括一背光模組，發射一光源； 利用該光源進行一點燈檢查；以及 利用一相機擷取該光源穿透該偏光板之一影像； 確認該影像中一色度不均勻位置及一色度均勻位置；以及 比對該色度不均勻位置及該色度均勻位置之RGB色碼。 The evaluation method of the surface protection film according to any one of claims 1 to 8 further includes: A step of evaluating moiré, the step of evaluating moiré evaluates whether the panel made of the surface protection film has moiré, including: Bonding the surface protection film to a polarizing film to make a polarizing plate; bonding the polarizer to a display panel, wherein the display panel includes a backlight module emitting a light source; Use the light source to perform a one-point lamp inspection; and using a camera to capture an image of the light source passing through the polarizer; Identifying a location with uneven chromaticity and a location with uniform chromaticity in the image; and Compare the RGB color codes of the uneven chromaticity position and the uniform chromaticity position. 如請求項9之表面保護膜的評估方法，其中比對該色度不均勻位置及該色度均勻位置之RGB色碼更包括： 取得色度不均勻位置之一亮度不均勻位置色碼R1、G1、B1以及一亮度均勻位置之一亮度均勻位置色碼R2、G2、B2；以及 利用一公式計算亮度不均勻度，其中該公式為亮度不均勻度=√((R1－R2) 2+(G1－G2) 2+(B1－B2) 2)。 As the evaluation method of the surface protective film of claim item 9, wherein the RGB color code of the position of uneven chroma and the position of uniform chroma further includes: obtaining the color code R1 of the position of uneven luminance of the position of uneven chroma, G1, B1 and a color code R2, G2, B2 of one of the uniform brightness positions; and a formula is used to calculate the brightness unevenness, wherein the formula is brightness unevenness=√((R1-R2) 2 +( G1－G2) 2 + (B1－B2) 2 ). 如請求項10之表面保護膜的評估方法，其中亮度不均勻度小於50評估為正常； 亮度不均勻度為50~110之間評估為輕微；以及 亮度不均勻度大於110評估為嚴重。 The evaluation method of the surface protection film as claimed in item 10, wherein the evaluation of brightness unevenness less than 50 is normal; The unevenness of brightness is evaluated as slight between 50 and 110; and A brightness unevenness greater than 110 was evaluated as serious.
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